| OFFICER RANK STRUCTURE COMPARISON CHART | ||||
| GRADE | US ARMY | US NAVY | US MARINE CORPS | US AIR FORCE |
| O-1 |
 Second
Lieutenant (2LT) |
 Ensign
(ENS) |
Second
Lieutenant (2Lt) |
Second
Lieutenant (2Lt) |
| O-2 |
 First
Lieutenant (1LT) |
 Lieutenant
Junior Grade (LTJG) |
First
Lieutenant (2Lt) |
First
Lieutenant (1Lt) |
| O-3 |
 Captain
(CPT) |
 Lieutenant
(LT) |
Captain
(Capt) |
Captain
(Capt) |
| O-4 |
 Major
(MAJ) |
 Lieutenant
Commander (LCDR) |
Major
(Maj) |
Major
(Maj) |
| O-5 |
 Lieutenant
Colonel (LTC) |
 Commander
(CDR) |
Lieutenant
Colonel (Lt Col) |
Lieutenant
Colonel (Lt Col) |
| O-6 |
 Colonel
(COL) |
 Captain
(CAPT) |
Colonel
(Col) |
Colonel
(Col) |
| O-7 |
 Brigadier
General (BG) |
 Rear
Admiral Lower Half (RDML) |
Brigadier
General (Brig Gen) |
Brigadier
General (Brig Gen) |
| O-8 |
 Major
General (MG) |
 Rear
Admiral Upper Half (RADM) |
Major
General (Maj Gen) |
Major
General (Maj Gen) |
| O-9 |
 Lieutenant
General (LTG) |
 Vice
Admiral (VADM) |
Lieutenant
General (Lt Gen) |
Lieutenant
General (Lt Gen) |
| O-10 |
 General
(GEN) |
 Admiral
(ADM) |
General
(Gen) |
General
(Gen) |
| O-11 |
 General
of the Army |
 Fleet
Admiral |
General
of the Air Force |
|